JPH0486385A - Sealed type electric compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic electric compressor used in an air conditioner.

BACKGROUND OF THE INVENTION Conventionally, as shown in FIGS. 7 and 8, a hermetic electric compressor has a structure in which an electric motor section 2 and a compression mechanism section 3 driven by the electric motor are disposed inside an airtight container 1. The stator 2a of the electric motor section 2 and the cylinder section 4 of the compression mechanism section 3
are press-fitted into the sealed container 1, or 4c, 4d,
The compression mechanism section 3 is fixed by welding at point 4a, and the compression mechanism section 3 is connected to a crankshaft 5 that is directly connected to the rotor 2b of the electric motor section 2, and a screw disposed inside the cylinder 4. Bearing end plates 7 and 8 for closing the cylinder 4 are arranged at both ends of the cylinder 4, and the compression space formed by the inside of the cylinder 4 and the outer diameter of the piston 6 is connected to the suction side 4a. A partition plate 9 is provided between the compression side 4b and the compression side 4b, and a discharge hole (not shown) is provided in the bearing end plate 7 or 8.
A discharge valve (not shown) for opening and closing the discharge hole was provided.

In the above configuration, when the electric motor section 2 is driven, the refrigerant in the refrigeration cycle having a well-known structure is sucked in from the suction pipe 1a and from the suction side 4'a- of the cylinder 4 as the piston 6 moves. It flows to the side 4b where it is compressed, passes through a discharge notch (not shown) provided in the cylinder 4 and a discharge port (not shown) provided in the upper bearing end plate 8, and then flows through a discharge valve (not shown). ) and remove the discharge muffler 1.
The liquid is discharged into the space 10a in the air, discharged into the closed container 1 through a discharge hole (not shown) provided in the discharge muffler 1Q, and discharged into the refrigeration cycle again through the discharge pipe 1b.

Problems to be Solved by the Invention However, when the compressed refrigerant gas pushes up the discharge valve (not shown) and is suddenly ejected from the discharge hole (not shown), large pressure waves are generated that cause damage to various parts. It propagates into the space, generates large gas pressure pulsations, and
In addition, the closed container 1 is vibrated from inside to generate high frequency vibrations in the closed container 1, thereby inducing noise.

The present invention was made to solve the above problems, and an object of the present invention is to reduce compressor noise.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an electric motor and a compression mechanism section driven by the electric motor that is disposed inside a closed container, and the compression mechanism section is welded to the closed container. Alternatively, in an electric compressor fixed by press-fitting, the above-mentioned
: A damping member is provided that has the highest damping effect at the temperature of the outer wall of the closed container during operation of the E-compressor.

Further, in the present invention, the vibration damping member is installed at the antinode of high frequency vibration of the closed container. Further, in the present invention, a thin restraining plate is closely fixed to the thin damping member portion and the outer wall portion with the damping member, thereby reducing the thickness of the damping member portion.

Effect: According to the above structure, the high frequency vibrations of the closed container are damped, so the noise of the compressor is reduced.

6 \ Embodiment The present invention will be described with reference to the accompanying drawings showing one embodiment thereof. FIG. 1 is a principle diagram of the present invention, and FIG. 2, FIG. 3 is a sectional view showing an embodiment of the present invention.

First, the principle of the present invention will be explained with reference to FIG. 1(a). When the closed container 1 is in a bending vibration situation, the closed container 1
The damping material 11 that is tightly fixed to the damping material 11 similarly causes bending vibration, but due to its expansion and contraction, loss occurs inside the damping material 11, and the vibration energy is converted into thermal energy, resulting in damage to the sealed container 1. The bending vibration level of vibration is reduced. In addition, as shown in Fig. 1(b), in the case where the damping material has a restraining plate 12 on the upper part, the shear deformation of the damping material becomes large, and the damping material 11
Since it is a type that exhibits a high effect even if it is thin, it has the advantage that the total thickness does not need to be increased.

2 and 3 show a hermetic electric compressor in which the electric motor section 2 and the compression mechanism section 3 disposed in the hermetic container 1 are welded and fixed to the hermetic container 1, 40, 4d,
4e, and the welding position ac, 4a
An embodiment is shown in which a damping material 11 having a restraining plate 12 is installed on the outer wall of the sealed container 1 between 40.4+5 and the lower part 1C of the sealed container 1.

In the above configuration, when the compressor is operated at full speed, the airtight container 1 is damaged by the electric motor section due to the large gas (1) and pulsating force generated inside the compressor. Points 4a, 4C1, a where the cylinder 4 is welded and fixed to the stator 2N of No. 2 and the sealed container 1, 4a, 4C1, a
It has a vibration mode at a high frequency in which θ is the node of vibration and the others are the antinode of vibration, but since the damping material is installed at the position where the antinode of vibration is, the vibration energy of the sealed container 1 is reduced. is converted into thermal energy inside the damping material, and as a result, the noise generated from the closed container 1 is reduced.

Next, FIG. 6 shows the vibration characteristics of the compressor having the above structure and the closed container 1 of the conventional compressor, and FIG. 6 shows the noise characteristics.

From these results, the compressor with the configuration of the present invention has a 2000 I
At high frequencies above 1z, the 1y during resonance is eliminated or relaxed, and as shown in FIG. 6, results were obtained in which the noise value was significantly reduced at frequencies above 100011z.

Effects of the Invention As is clear from the above explanation, the hermetic electric compressor of the present invention is characterized in that a damping material is provided on the outer wall of the hermetic container of the compressor to absorb high frequency vibrations of the hermetic container. This method has the advantage of significantly reducing compressor noise using a relatively simple method.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the principle of the present invention, Figures 2 and 3 are cross-sectional views showing the principle of the present invention.
The figures are a cross-sectional view, a cross-sectional view, and a cross-sectional view showing one embodiment of the present invention, respectively.
Fig. 4 is a schematic diagram explaining the vibration state of a sealed container, Fig. 5 is a diagram of the first vibration during vibration, Fig. 6 is a noise characteristic diagram, and Figs. It is a diagram. 1... Airtight container, 2... Electric motor section, 3
...Compression mechanism section, 4...Cylinder, 4a
......Compression space suction side, 4b...Compression space compression side, 40, 4d, 4e...Cylinder/closed container welding point, 5...Crankshaft, 6...
Piston, 7...Lower bearing end plate, 8...
・Upper bearing end plate, 9...Partition plate, 1o...
・Discharge muffler, 11... Damping material, 12...
・Restraint board. Name of agent: Patent attorney Shigetaka Awano (1 person)
Figure■...Seikonbetsuya 11-・1winter y 12''-Restricted analysis one ('o) Figure Kurabuki-yahemo・) Ward Toyosaki Sakaki ha and →

Claims (3)

[Claims] (1) In an electric compressor in which an electric motor and a compression mechanism section driven by the electric motor are disposed inside an airtight container, and the compression mechanism section is fixed to the airtight container by welding or press fitting, the outer wall of the airtight container A hermetic electric compressor, characterized in that a vibration damping member is provided in the airtight container, which absorbs high-frequency vibrations of the hermetic container and exhibits the highest damping effect at the temperature of the outer wall of the hermetic container during operation of the compressor. (2) The hermetic electric compressor according to claim 1, wherein the vibration damping member is installed at an antinode of high frequency vibration of the hermetic container. (3) The closed type according to claim 2, wherein the damping member is formed by closely fixing a thin restraining plate to the thin damping member portion and the outer wall portion of the damping member member to reduce the thickness of the damping member portion. Electric compressor.